No doubt the Africa Twin is proving to be a great success for Honda. It's good for a big trail bike IMO, rides smaller, feels lighter than the competition (BMW, KTM, Aprillia, Yamaha Super Ten) for it's 500 lb. wet weight.
But it's still big, tall and heavy. Perfect for many, not for all.
But as noted, many riders will stick 85% to tarmac, so the T7 will have to be fast, smooth and comfortable on road to compete with the big bikes or even the middle weight BMW 800 or 800 Tiger.
No one wants to do RTW on a full Dakar bike, so concessions to comfort (hence my reference to Super Tenere earlier)will be made.
A full suite of electronic gadget add ons will boost price (ABS, TC, Elec. Suspension) but also make it more competitive with BMW GS and the like ... but for a lot less money. (new GS's now come in around
$23K USD, KTM not far behind

)
If Yamaha can manage to have the T7 ride smaller/lighter than it's weight, that will help. For any sort of dirt road or track, should be OK, even loaded up. But get into deep sand, mud, serious rock gardens ... could be a problem. on the beast.
The 190 kg. weight I quoted is probably optimistic. But if not too serious off road is planned, then should be fine loaded up, even two up, if Yamaha lay it out correctly and get the geometry right and centralize the mass properly.
The weight on modern bikes comes from the use of BIGGER forks, BIGGER swing arm, stronger frame, spoked wheels. The engine is a tall wet sump lump, so oil pan hangs down quite far. Yam could go dry sump, but probably too late for that now ... tooling is done as the engine comes from previous model.