Yes, Wong teasers work by crossing the key numbers of 3 and 7 so at -110 they were statistically profitable. Obviously, the extra point conversion rate is down, weakening the 7. Going for two is about 0 EV instead of -EV so teasers only up to 7.5 are weakened. Also extending OT by an answering possession after a FG, and reducing OT to 10 minutes has marginally weakened the 3 due to increased ties, weakening fav teased down to -1.5 to -2.5pt teasers.
Now, its a somewhat closer proposition and most books charge -120 for 6 pt NFL teasers.