I think that eventually it's not going to be an issue (or a choice). The laws will change because of the EPA and such to make 4 strokes mandatory. Just like seat belts and other safety items on cars. If you have a car that was made without them you can continue to go that route, but they are mandatory on all the newer cars. And like the mandatory emissions rules, I think outboards are going to hit that same wall. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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