Do it 
10 years from now, who knows that the model train world will look like? N scale is big overseas - perhaps focus on that. I have a lot of N-scale stuff and upgraded most of it to DCC over the last couple years. It's a blast, but in a different way. N-scale is good at some things (cost, standardization, large trains/space, etc.). I can put an N scale layout on my (admittedly large) dining room table that is more complex and interesting to run than my O-scale layout. More variety, larger yards, less power. With DCC, all I lose is sound, which you don't HAVE to give up but it's so weak I don't see the point.
Storage seems like a joke to me. You take a bunch of stuff thats currently not worth what you paid for it, lock it up for ten years where it will be worth considerably less, and pay for the privilege? Not in my world!
And here's the thing - you may NOT regret it. You never know. You might get really into N scale, you might find other hobbies, etc. Your world is expanding right now - let it expand and roll with it. Don't let something like model trains slow you down - maximize this opportunity with NO regrets. if you THINK you will regret it, you WILL regret it, and that's a bad way to live.
SELL !!! And good luck!!!
