Integrated meter? Piece of cake.
But would be incredibly expensive (probably several thousand $$). This is due primarily to the very tiny market -- no economies of scale -- and the FDA gauntlet that would have to be run for approval.
Further, because of the price, juxtaposed against free meters that fit in your pocket, I don't think there would be much of a market at all for it.
Test Strips: A "universal" test strip is a nice idea, but that won't ever happen either (without force by gubmint). Several reasons: The detailed chemistry and algorithms used by manufacturers is a trade secret. This is because these variations at the margin -- i.e. things that have nothing to do with accuracy, per se -- are where are the competitive differentiation takes place.
Speed of results, blood drop size, ease of application, etc. etc. -- these things are where the different companies compete. They all have to meet a minimum accuracy standard, so they compete on those other things.
And in the end, we the D community, want competition!