Earlier quoted context omitted.
Switching supermarkets is much, much, easier than switching backends. I'm sure lot more BaaS companies will pop up to grab former Parse customers. I'm not sure how many of those will still be around in another 5 years. I strongly suspect there's something negative about the economics of BaaS services that's being implied by the fact that two of the most successful providers have shut down after acquisition.
Amazon has fully embraced BaaS. And I don't know of any AWS services they've added and then removed. I think Amazon will be the winner here. MSFT is also starting to embrace BaaS. Of course they have a less stellar history of support.
Microsoft supported products: Azure - six years, .Net & Active Directory - thirteen years, SQL Server - seventeen years, Visual Studio - nineteen years, and Excel - twenty nine years.