Blaze Engine and the Future

Hello ,
I was wondering about the future of Blaze Engine,
could it be deprecated in the coming versions of meteor ?
if yes , can i still stick to an old version of meteor to keep on use the blaze ? Or will I be forced to move on with the newer updates/changes ?
i am really worried about this issue, I have been using blaze for almost two years in building a huge app and migrations would be a nightmare to shift everything
hope one of the expert guys here could clarify or remove all doubts i am thinking about