Due to other efforts, it may be wise. Delisting suppressors is more likely to be successful at some point or another. If you already have them, you already have the tax stamp, therefore you have legal possession. If they delisted them, you couldn't get tax stamps on any others, therefore, additional ones would be illegal under existing CO law.
ETA: Transferrables, I wouldn't worry about. Supremes aren't going to sign off on cheap full autos for undesirables. What WILL happen is we'll have a case law where the Supremes justify their position with some bullshit explanation, that then gets recited as precedential law to justify new gun control going forward.
Conservatives should've taken a playbook from the left - do an incremental approach and only pursue winning cases. Headline generation cases produce adverse case law that later blows your own toes off.