You can’t have a “base” in an organization with 5 digit membership in a country of 325 million. The CPUSA had almost 75,000 official members at its peak in a country of 125 million. And the risks of being a CPUSA member in the 30s were much higher than being a DSA member.
I don’t understand what you are saying here. You cannot have an engaged base of members with five digit membership?
The DSA isn’t supposed to be a hobby club or a volunteer organization. An “engaged base” of 50,000 people isn’t going to do jack shit in a country of over 300 million when the goal is a political project. Especially when you keep it 100 and consider who is actually in the DSA - they aren’t threatening anyone in power anytime soon.