Darby,
You can just tell by your post that you are passionate about riding, and you ride for you. My HB introduced me to riding but instead of riding a certain way or certain speed so he is "happy" or I keep up all the time, I have also learned to ride just for me. I needed to make cycling my own, decide on my goals, which I did and loved it even more then AND I got better at it. I think that's where you are. And you seem like a heck of a good rider, keep riding.

Re: the training while travelling, I travel for my work as well, sometime frequently at a clip. My other problem is I can have a long day as well as a time change (usu it's US-Europe or vice-versa) so despite my best intentions, getting to the hotel gym never seems to happen. Not sure if you travel with a laptop with a DVD player, but I found that's the best training I can do when travelling (unless you run perhaps, as that's easy to pack for also). I do strength DVDs specific to cycling -- for ex, Graeme Street has some outstanding core strength DVDs for cyclists that I love. And they also have power yoga routines on there as well. Check out cyclo-core.com. Or if you have a fave power yoga DVD, bring that. Yes, you'll miss out on the cardio, but unless you can commit to running or using the hotel gym, this is a great alternative. Add some lunges and squats to your hotel routine for a little spike at least in cardio and get the heart rate up. But Street's cyclo-core program does have a killer floor workout for cyclists that will get the heart pumping!! I have both Cyclo-Core and Cyclo-Zen. Even if you don't have a laptop with you travelling, you can piece together good routines and make your own to follow.

Re: what to do about the bikes. Tough question. Do you LOVE LOVE LOVE your mtb bike? Even on the road? I found I can love my MTB on the trails but I hate riding it on the road, mostly because I know what the road bike feels like there. So, IMHO, my vote would be to see if you can find a decent road bike, even used. Esp if you might race with it, you'll find it's probably a better investment than another set of rims for the MTB. Leave the hybrid on the trainer then...or honestly, with most trainers, popping the bike on and off is a breeze. So putting your road bike on there during the WI winter when you are most likely to train there shouldn't be a problem.

Good luck, with everything...the bikes, the training, the men etc!!!