One thing you can expect for sure:
The "exclusive" Ducati's, the rare ones, that are already expensive will get more expensive. There will be greater stratification between the pleebian bikes (Panigale 1299) and the collectors level (Panigale 1299 R superlaggera).
HD have a knack for creating "collectors" or "special" editions of standard bikes for extreme price increases, Ducati already does it, but HD will almost certainly say "Well its already $40,000, why cant we make it $45,000, people will pay it". Sadly, they're right, people will pay it, and it will create headroom for other manufacturers to increase their prices.