It is very hard to build a business and the most important qualities moving forward are perseverance and commitment. both of these are impossible in view of your "disbelief" in the approach of your partners. Therefore, IMHO you will find it difficult to satisfy a key role until you agree with the plan or accept your position as an underling. Both of these are hard to do.

I suggest that you evaluate the business to decide if you want to keep or sell your shares independent of the decision to move on.

That said, often times people view their partner's plans as flawed because they do not fully understand them and English is a horrible language for communicating ideas and plans. So, don't jump before you have somewhere to jump and spend time trying to understand the benefits of the current plan. Maybe you will come onside and realise that it is you who failed to see the bigger picture. This has happened to me before and to people who worked for me.

Don't rush unless you have somewhere else to be!