Five years from now who knows what the "hot" new thing will be. One thing I can tell you, over all the years we've owned RVs the higher end amenities have always seemed to trickle down to the more moderately priced rigs and even the least expensive DPs have power that rivals what the high end rigs did 5 or 10 years ago. I'd not buy now simply because you're worried what you want will not be available in 5 years. Worst case scenario, you'll be able to buy that same rig you have your eye on now for a fraction of the price paid when it was new, and low mileage rigs of 3 to 5 years of age are not all that difficult to find.
Buy now if you would use it now. If not, hold off. They make for extremely expensive lawn ornaments.
Jay & Peggy Monroe with Dolly
Can't take it with you - don't plan on leaving any behind
2016 Newmar London Aire 4553, Spartan chassis
Wrangler Unlimited toad