This is a good thing. Microsoft will bring stability to the system. We can be sure that all the rules will be properly playtested and balanced before the release. Also, books will be published in binders (as in AD&D Monstrous Compendiums), and updated rules (called service packs) will be available for download from Microsoft's site on a daily basis free of charge. Download the rules update, print it out, replace the outdated stuff, play!
Other benefits include the new "restart game" rule in the DMG, which will enable the DM to avoid player sidetracking and bring the game back to the fold once it gets out of hand. A new product called Player's Handbook Plus!, including numerous essential new tables (eye color, hair color, piercings, tattoos, pets, family, friends, allergies, etc.) that players have always been asking for, will be released by the end of the year.