With MS stopped the further development, a new Sim is years away.
So this will mean undoubdedly that lot's of people still using FS9 to great content will remain doing so... no urge to update to FSX.
By taking that decision MS extended the life of FS9 for years to come !!!!
So likewise other great addon developers (I won't name them all here to avoid the reply being removed) all remain supporting FS9 so I don't see why CS shouln't.

I'm a Quality Manager in real life, and I can say in business you can't treat your customers this way or it will bounce back on you.