With all due respect to Pete's point of view, I'd suggest first defining the load and then seeing if the current bike is sufficient. If it isn't, then look for something better. Not everyone tours with 15 pound loads, so the light bike that's OK for that may not be adequate for handling the final load.
My point was definitely NOT that he should pack super light. It was that spending a lot for an expensive touring bike might be a bad idea until you know what your touring style will be not only now but a few years down the road, because you may well not know what you will eventually want especially when you are just starting out.
I am suggesting that the bike he has might be adequate (hard to tell since we don't really know what he plans to carry) and that if it isn't he may be wise not to go too crazy on the budget for the new bike if he decides he needs one. There are new bikes in the $600-1000 range that are quite adequate and used ones even cheaper. With a less expensive option you also get the benefit of not having to worry as much if it will be stolen because it is less likely to be and also less painful to replace if it does.
BTW, I agree on the notion that defining the load comes first. Starting from scratch, I see the best decision order as, define load, choose baggage style that suits the load (trailer, panniers, bikepacking bags, stuff sacks), then choose the bike that suits the load and baggage style. The thing is that if you already have the bike, luggage, and/or gear the order of decisions may be altered.
It would suck to have spent $5000 for the ultimate heavy touring bike and another $1000 on heavy duty racks and panniers only to find that you actually prefer to travel ultralight.