I'm fine with widening 270 (it already needs it), but NOT with displacing much of the traffic off of I-70 (which turning it into a boulevard with lights would do).  The interchange at I-25 already struggles enough to handle currently growing traffic from 270.  270 PLUS a bunch of the I-70 traffic would be wholly untenable.  

Yes, it's the interstate highway system, meaning I-70 isn't just for beginning or ending trips in Denver.  It's for getting THROUGH Denver too.