We did 10 days of Disney but stayed off-property (rented a house with a pool). We did 2 full days of MK plus 1 evening (after spending the day at Sea World and still having 1 more day left on our passes), 2 days at AK, 1 day at Hollywood Studios, and 1 day at Epcot (you could easily do 2 at Epcot, and spend 1 of those days in the World Showcase, but the rest of my family was not as interested). The other 2 days my husband and stepsons (older teens) went to Universal and I stayed back with our daughter just to have a day off and hang around the pool.
Your schedule sounds fine, it just depends at what pace you go at while visiting the parks. Remember that without a park hopper pass, you can only visit one park per day - so then you have to plan accordingly (i.e. Fantasmic, the nighttime show at Hollywood Studios might only be done certain nights, so you would have to do Hollywood Studios that day to see the show at night). With a park hopper pass, you could do one park during the day and a different one at night, so it does give you more flexibility.