Fusebox is still under active development and just recently changed hands so the lead developer is now Adam Haskell.
Should you switch to another framework?
That's a subjective question. The only good answer is that -- given infinite time and opportunity -- you should try them all and see what you prefer. They all have their pros and cons, but most people agree that it's not a question of which framework as much as a question of to framework. You're already decided that it's a tool you want on your belt, so good for you. Make it a tool you understand and enjoy.
That said, time and opportunity are not always available. In that case, you're probably best off sticking with what you know and learning what's new with the latest changes to Fusebox. I don't have time to learn them all myself, so I have been a Model-Glue guy myself. I see some Fusebox in my near future, but again, it's subjective and what matters is that you're doing what works best in your situation.
PHP
I can't really speak to the status of PHP frameworks as I'm a CFML developer. Again, if you have the time, play with them and evaluate where they're at and whether they are a tool you're interested in using.
ORM Integration
I know Model-Glue has ORM integration -- Reactor and Transfer both hook in very easily. I suspect the same can be said for Mach-II, and probably Fusebox but I'm not positive about either.
ColdFusion 9's baked in Hibernate will probably work nicely in any framework, but that's yet to be seen.
Performance / Caching; Parsed files?
That's more of a ColdFusion vs. .Net question, right? PHP is a "parsed" language as well. Pre-compiled binary code will always have at least a slight advantage in run-time, but consider that for most web applications adding some more capable hardware is easier and less expensive than spending an extra few months (or more) developing the software.
Are "parsed" files still good enough? Yes! Heck yes!
Integration & Test Frameworks
There are multiple testing frameworks, including CFUnit, CFCUnit, and MXUnit off the top of my head for unit testing (which work well for TDD), and CFSpec for BDD. I'm sure there are plenty of others, too.
CF8 brought integration with .Net, and Exchange (and probably a few other things I'm forgetting), and we've had integration with Java since version 6. It's never been easier to "mash-up" some components written in these various languages to get the best of all worlds.
Conclusion
Your question title is about the future of the Fusebox framework, and I can tell you that it's not going anywhere (except to continue growing and improving, like the other CFML frameworks...). If you're happy with Fusebox, there may be no reason to leave it. That doesn't mean you shouldn't try everything, but there's no reason to abandon ship.