As shown by the replies to the original post, whether one can tolerate 5 in a studio is mostly a personal issue. Some can easily do so, some cannot (I am among the "cannots"). TinkB278 (the original poster) mentions that they could easily do it while the kids are little, which, if true, likely indicates they can do it when the kids are older (e.g., I could not do it even if the kids are little), but the issue TinkB278 could face then would be whether those older kids would rather not do it.
Mentioned above is the possibility that changing the studios to have bedding for 5, such as at AKV, which currently allows four, could have an issue with local codes applicable to room capacity. Such codes actually do not create capacity per room for hotels or timeshares. Instead they create capacity per floor, with the principal consideration followed in creating them being how easily all those in the rooms could exit the floor via the number, width and location on the floor of exit stairways in the event of a fire.
The changing of the studios to allow 5 (six actually since you can also have an infant under 3), is most likely not an issue since the change has already been done for some of the
DVC resorts (BWV, BCV and BRV) , which would not have been done unless the change complied with the codes.
Nevertheless, no one should purchase AKV based on the assumption that studio room capacity will be changed to 5. They changed the studio capacity for BWV, BRV, and BCV when doing refurbs started in 2016, but did not change it for SSR in its recent refurb done after those three refurbs, did not do it for OKW whose last refurb started in late 2017 after those three were done, and did not do it for AKV whose last refurb started in 2016 during the same time as the refurbs were being done for the three. SSR recently added the extra pull-out-from-a-cabinet bed in the living room of the 1BR but that is something that simply makes its 1BRs have the same capacity that AKV and OKW 1BRs already had. Thus, it appears likely a decision was made previously to change studio capacity for those three near-.park resorts but not change studio capacity for the much larger resorts which had bus-only transportation to any park. The addition to the studios at BWV, BCV, and BRV may have been a decision made by DVD to aid sales of points it got for those resorts via foreclosures and ROFR of resales, but did not do it for OKW, AKV or SSR because of the lower prices per point and the need to spend larger amounts to make the change for a lot more rooms per resort.