When Facebook CEO Mark Zuckerberg appeared to call the company's decision to build an HTML5-based mobile app a "mistake" it was seen as a blow to the web standard's future as a mobile development platform.
But for every firm that switches away from HTML5 to native mobile app development there are major companies, such as the Financial Times and LinkedIn, that have adopted HTML5. Indeed, Zuckerberg - whose quotes were taken out of context - himself says he is "excited" about Facebook making greater use of HTML5 in future.
And while HTML5 has still to overcome the shortcomings of its relative immaturity as a mobile app-development platform, Krzyzak believes that the sheer volume of mobile platforms will drive developers to favour HTML5.
"I can see at some point in time that everyone will be doing it," he said.
"The fragmentation of mobile devices is really big. This is like what we saw 30 years ago with the PC, with hundreds of standards and everyone wanting to produce their own PC."
He predicted it will take five to 10 years for mobile platforms to converge around a standard, and that in the meantime HTML5 will become the de facto choice for developers looking for a manageable way to make apps for the panoply of platforms.
HTML5's savings in cost and effort
According to Krzyzak, writing apps in HTML5 code not only reduces cost over native app development, largely avoiding the need to reproduce apps in several programming languages and tools, but also avoids fragmenting the development effort.
Sarah Kennedy, director of Sabre's Travel Studios, the firm's product incubator, said: "You're keen to operate as a core unit rather than as multiple groups.
"It's great to have top talent focused on that single objective, to have one brain focused on delivering one experience to users."
Krzyzak acknowledges the current weaknesses of HTML5-based apps. Their performance is slower than native apps and they lag behind native apps in gaining access to new features of mobile hardware. But he believes that these problems will diminish.
"Speed is often bought up as a concern for HTML5 but in reality the processors on mobile devices are getting faster and the devices are getting more memory. This is exactly the kind of issue that was bought up about Java versus C++ 15 years ago, when people were concerned about the speed and the consumption of the memory.
"Now nobody says Java is slow and everyone is developing systems using Java," he said, predicting that the same will happen with HTML5.
Krzyzak also foresees the development of new APIs and hardware-support that will help HTML5 close the performance and feature gap with native apps.
"There are a lot of plans for new chips coming to market which have acceleration built in for HTML5, and that will change the situation - but we're not there yet."
Light client-side processing
And for an app such as TripCase the client-side processing is relatively light - so the increased burden HTML5 places on the CPU isn't a problem, he said.
TripCase gathers together all the information that travellers need about a journey - including flight times, seating plans and hotel bookings - in an app that's easy to use and which dynamically updates information.
"For the use-case we have, where we're trying to provide the traveller a trip management platform, along with the messaging capabilities, this is perfect, because most of the work is going on on the server side, and you're just rendering on the mobile device," Krzyzak said.
Apart from media-heavy apps such as games, many mobile apps have a similarly lightweight client, with the most common bottleneck being the latency of connections back to a server rather than processor load.
TripCase will switch to being a hybrid HTML5 app by the beginning of next year.
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Nick Heath is chief reporter for TechRepublic UK. He writes about the technology that IT-decision makers need to know about, and the latest happenings in the European tech scene.