Anything that implies the lock-up unless everything is rewritten completely is not a viable choice for me.
I'm wary of anything (especially JavaScript as trends change there faster than one can read the articles) no matter how praised it is. Sometimes things just do break in the most bizarre manner when you already have everything set up. If components are modular enough, you can swap them, or at least patch a completely new piece over the old one, to handle the problematic cases.
When I once had to replace a very old legacy system (non-web, but it still holds) I've just slapped a dummy do-nothing proxy-like system in the front and gradually did stuff piece-by-piece. Then threw out the old garbage when it wasn't doing anything anymore.
But from what little I understood about Meteor from the tutorials and examples, there's one single giant system, that you either use or don't. This means, if one hits some bug or - worse - architectural limitation, they're going to have really tough time.
I'm wary of anything (especially JavaScript as trends change there faster than one can read the articles) no matter how praised it is. Sometimes things just do break in the most bizarre manner when you already have everything set up. If components are modular enough, you can swap them, or at least patch a completely new piece over the old one, to handle the problematic cases.
When I once had to replace a very old legacy system (non-web, but it still holds) I've just slapped a dummy do-nothing proxy-like system in the front and gradually did stuff piece-by-piece. Then threw out the old garbage when it wasn't doing anything anymore.
But from what little I understood about Meteor from the tutorials and examples, there's one single giant system, that you either use or don't. This means, if one hits some bug or - worse - architectural limitation, they're going to have really tough time.