Do you have any arguments as to why that would be? Or are you just making a blanket "M$ is evil" statement? Azure's been getting better and better, you can run Linux VMs and "apps" in a multitude of languages, similar to Heroku. I don't see how it can be a bad thing.
If they sunset Heroku in favor of the parent company's Azure architecture?
my thoughts exactly. whilst i don't care about Salesforce's CRM, i wouldn't want MS to put their hands on heroku. Once MS bought one of my favourite companies (Rareware, now Rare as part of MS Game Studios), effectively they killed creativity. I'm not saying that MS is necessarily evil, all I'm saying is that I've seen this once and I have been really disappointed.
Interestingly one could say the same about salesforce.com. What positive things have they contributed to Heroku, beyond hoping their developer community would start making apps for salesforce.com overnight (which they didn't).
And do many people actually use Heroku for anything serious? Once they hit a certain size it seems Heroku quickly becomes uneconomic.
Heroku had its time in the sun but rapidly that day is coming to an end...