Not really. Disney Animation's films are hardly lacking in merchandising.
Sure, every animated film will have merch, but new IPs are always a risk. Frozen is the only thing from the new WDAS that has really blown up. What I mean is that Pixar has been focusing on easy money this decade, something that they never did in the 15 years prior.
I am sure it will still be decent to good, but does Toy Story really need a fourth film other than to sell more Toy Story toys to the next batch of 4-9 year olds? Even if you were one of the people who loved TS3 (I was pretty neutral on it), that was already the perfect send off to the series.
Cars 3 is even more transparent. So much so that Pixar/Disney bring up that $10B+ in merch whenever people start grumbling about the films.