You really don't get it. The standards set down by MS (and others) were all that mattered - the ability for MS to deliver what they envisioned for the Internet. The browser is a means, not an end.
Of course MS wants to remain the dominant browser (what company won't) but IE dominance is not required for MS to continue to be successful. Do the math. MS makes zero dollars off the browser.
The only way MS would be hurt is if a new browser become dominant and that browser did not support MS content (the stuff they make money on). That is not going to happen - at least not in the near future.