He would be seen as more "cool" by people who care about that sort of thing.
Oh, and maybe he'd spend more time on the songwriting process and less time being Wonky. Which, let's be honest, probably wouldn't be a bad thing.
The thing is, what did Lennon actually accomplish? Oh sure, he had "bed ins" and all sorts of protests and media exposure. And he spouted his views and what was "wrong" with the leaders of the world. But what did it really accomplish?
Some might say they were inspired by Lennon and therefore pressured their governments to do something. But did that really do anything? The Vietnam War hardly ended any sooner because of pressure by the public.
Bono is over-exposed and hated for it. But he's silently done a lot of charity work and then openly done BIG charity work - like the creation of DATA. There are real results already, with debt relief (not loans). Also, U2 fans have set up organizations that have produced results, like the well funds. ONE is another organization producing results, as is RED.
In other words, let the writer call Bono a wonk - the difference is the results. And this is why I respect Bono's activities.
Sadly, Lennon never got the chance to move to where Bono is now. It is arguable that in the 1980's, Lennon may have very well left his rebellious side and worked WITH the system. People in their 20's and 30's want to fight the system. Being a rebel is "cool". For example, I have a young friend who is so anti-corporation he can't stand any company or governments. Trouble is, what does that get him? He just gets himself all worked up, but what has he accomplished? Awareness? Corporations can be corrupt. Governments can be corrupt. Lobbyists control big government. Gee, like we don't know this. My friend's type of rebellion, just like Lennon's of the late 60's, rarely accomplishes anything. Bono had his rebel days too - just listen to R&H. But what did that really get him? What did that get us? Even in the early 90's, U2 staged a Green Peace protest. Great. But did that truly change anything? As far as I know, the Irish Sea still has nuclear plant pollution. Was that protest well founded? Yes, monitoring radioactive waste is crucial - but nuclear power is actually a compatively clean source of energy. Would one rather have energy-inefficient, cancer-causing, mine-collapsing coal? A better way to have moved forward was not to protest the plant, but to ensure that proper precautions were implemented to ensure all safety measures are in place.
As the 90's ended, Bono's activism increased to where it is today - but it is dramatically different from the Bono of the 80's and early 90's. This Bono works the system and gets things done. And I have a feeling Lennon may have done the same in the 80's. In fact, given Yoko Ono's embrace of Bono's work, I have a feeling Lennon and Bono would very much so be together on this.
Working within the system may not be cool, but results are obtained. And ultimately, isn't that the real goal?