Of course there is always a reason to look at a competitor. My point is not to give your customers a compelling reason to look. I mean things like the recent Unity nightmare. If you put up some kind of roadblock - like the transition from Web 1 to Web 2 - that forces developers to consider their options, they might consider to move away. For example, my Xojo app is available for Mac and Windows, though I’d love to have mobile and web versions. Xojo’s offerings for mobile and web are not good enough (in my opinion) so I’d have to rewrite in another tool to make that a reality. If Xojo were to do something to the desktop version that forces me to more-or-less rewrite my desktop app, why would I not take the opportunity to go elsewhere? And this isn’t hypothetical, this happened for some developers, just with web in place of desktop.
Of course, maybe upon reviewing options I’d conclude that sticking with Xojo is still the best move. It’d be less work to rewrite in something I know than something I don’t. But my point in all of this is the company (Xojo, Unity, whomever) should never put a fork in the road and force the customer to consider wether or not they want to stay a customer.