I assume if companies have already drafted up plans for a new investment and done a lot of the planning and design work already, if they can afford to go ahead with the project, then they will.Interestingly, the virus doesn't seem to have deterred Cedar Fair from building new rides; Kings Dominion is still going ahead with its Free Spin for 2021, and Dorney Park has just filed to build a new coaster for next year!
The projects which the virus is going to impact are probably the ones which haven't started to be planned or any design work taken place yet. Probably projects in initial brainstorming stages are the ones most likely to be discarded.