I'd be more concerned about ARM support stagnating.
RISK-V is currently not really that competitive on the lower end marked as there are just too cheap ARM chips
but it is e.g. very competitive for companies needing large quantities of simple but slightly customized chips where existing cheap ARM chips aren't an option and customized arm chips are too expensive
and there are currently no competitive RISK-V chips in the high end marked
it can somewhat compete on the mid marked, if it wouldn't be for too low quantities driving the price up
it also could be interesting if e.g. Intel or AMD decides to enter the non x86 market as they could cut out license cost to ARM
but all in all I wouldn't be worried about ARM support being reduced in the ecosystem for many many years to come