We'd be totally happy keeping the old functionality of Stripe subscriptions and not getting any of the new hotness. I think Stripe has done a great job supporting old versions of the API, seems like we should just be able to stay on our old pricing / subscriptions functionality as well.
Saying that we can build the infra ourselves to do reoccurring kind of goes against what we purchased Stripe for initially. I know technically you can change your pricing/billing however you want but this is more of "let's capture more revenue from old customers" than it is "we launched a bunch of stuff thats new so pay for the new stuff".