Said it pretty much from day one but the best way to hurt Wasps is go and see CRFC and give them your money. A successful CRFC is by far the biggest threat Wasps will have.
Before Wasps there was not enough revenue in total between CCFC and ACL to keep them both profitable. In fact only the Olympics, extraordinary income and smart financial reporting made ACL appear profitable - but the truth is the cash flow was almost constantly negative. And that was back when the club paid £1.2m rent per year plus match day expenses (about £10k/match).
One reason - the main reason - ACL couldn't maintain a profitable operation was the £21m mortgage. The interest payments made the difference.
Now that loan is gone - but it has been replaced by an even bigger one. The interest payments way more than the Yorkshire Bank loan. And it's short term.
On the plus side Wasps is now adding revenue, but at the same time CCFC is paying a lot less. Stadium main Sponsorship is devaluated as long as CCFC hasn't committed to stay long term.
So, all in all I guess(!) that ACL/Wasps/CCFC combined are LESS profitable than previously ACL/CCFC were. Take away CCFC and I guess(!) ACL/Wasps are heading directly towards financial meltdown.
All efforts we see in action is to keep the club at the Ricoh.
So in my opinion, the best way to hurt Wasps is to take away their revenue. Demonstrate outside the gates. Contact their sponsors. But even more effective - move CCFC out, even to Northampton.