I agree that they should do away with the COMLEX, but it certainly isn't an easier exam. As to foreign graduates, DO schools have higher stats than basically every foreign institution that takes US students, so there is little reason to believe that DOs would have trouble passing the USMLE, particularly considering that many US DO schools have scores similar to US MD schools fifteen or twenty years back (whose students did just fine on the USMLE and in training and are currently the attendings at many of the programs the DOs are applying to these days).
In regard to whether to take the USMLE, we're already at a disadvantage. Taking Step 1 and Step 2 substantially reduces the barriers we have in regard to many programs, so if you can afford it and think you can pass, why wouldn't you take the USMLE?