I'd take Miles From Tomorrowland over Laugh Floor and Stitch. At least it actually is set in Tomorrowland
you're right that adding a preschool-skewing attraction is NOT what MK needs... we already have a whole land dedicated to the stroller brigade.
But GotG and WALL-E, possibly BH6, are the only IPs I would support coming to Tomorrowland. They're futuristic enough where I wouldn't mind them being there if they were well-executed. Of course, Tomorrowland won't be getting any love within the next 5-7 years other than possibly a Space Mountain overhaul.
Personally, I'd like to see Tomorrowland, Adventureland and Frontierland go wild with original attractions. Leave the IPs for Fantasyland, DHS and certain areas of AK. Unless a particular IP is a perfect fit (WALL-E in Tomorrowland, Indiana Jones or JttCotE/20K in Adventureland)