Tell you what just encourage people to go support the team...... forget about doing as a show of fan strength against the owners - they don't actually care so long as it isn't costing them more money.
Its a complete nonsense to think that the owners will give any assurances to the fans about spending on players especially when the club has to cover all its bills from the income it receives without further funds from the investors. Hardly going to be a written in blood contract is it. To think anything else misunderstands SISU and how they and Fisher are working the finances. It is unrealistic to think lots of fans will turn up to prove SISU wrong - they turn up when the team gets results and don't when the team fails it is as simple as that. If the club was winning and challenging most people wouldn't care that SISU needed to get out, they would go because the product brought enjoyment, pride and a sense of belonging.
Go watch the team because its your team, and encourage others to do the same - you wont change the attitude, objectives or timescale for the owners whether you can dismiss the broken trust or not