The general belief in this forum is that we are all here to discuss and learn about Bitcoin. But the financial benefit serves as a motivation to be more active. Also, some of the abnormalities that are recorded in the forum are a result of the financial benefits. So I agree that all the consequences OP listed above will be the case. There will be fewer posts and activities which will reduce the amount of spam and creation of more accounts.

It will also be an opportunity to see those that are interested in Bitcoin and people that don't rely on the campaign reward for a living. Those that have little or no interest in Bitcoin will quietly bow out. Most people that depend on the campaign fund will leave and seek other sources if income. While those that are independent of the forum earning will remain.