Sorry, perhaps my answer was a little unclear. I meant that even as Stencyl remains compatible (and it will, since it's still being developed), the nature of mobile app stores is such that things generally won't just stay ok on them forever. So in particular, I was responding to this part of the post.
let's say I published a game today would there be problems with it in time on the playstore.
At a minimum, the play store may introduce updates that, in order to take advantage of, you will want to download the latest version of Stencyl and export your game again for the store. At other times, you may want to re-release your game to properly support more recently released devices. Keeping an app up to date on an app store will often require some effort on your part.