Being an incurable optimist, i can find two reasons why MrDots is not going to drop soon or even keep DmD on hold for a longer period of time:
1st: "D" itself
Someone beeing able to write/develop such a warmhearted novel - triggering a hughe range of strong positive emotions with it (happiness, hope, bliss, love, ...) leads me to the thought "D and the whole DmD project is for sure nothing less than kind of MrDots baby". He simply can't and never will let his "baby" get harmed.
2nd: Statements on his website and on patreon
Even if english isn't my native language, i can clearly read between his lines that he is NOT in the right position to give Patreon even an atom of an indication which makes them think "MrDots is collecting funds through Melody and he is going to take these funds to develop DmD (beside Melody)" - neither on Patreon, on his or on DmD site.
That said, every "D"-enthusiast (in terms of DmD) would love to read such a statement from MrDots, getting a positive sign that it keeps running and gets further developed - slowed down a bit for the worst case.
He stated himself, that he, beeing kind of "patreon enemy number one", is simply not allowed to point to DmD anywhere at the moment without risk of losing the last buttress "Melody". Even the dumbest patreon employee is able to find his website and would be more than happy to find a DmD<->Melody context statement from MrDots...
My conclusion (assumingly)
If he does kind of splitted fundraisung through Melody atm, noone of patreon is able to check how many of his ressources are used to further develop DmD or Melody. Neither he or any of his team members is able to tell us about. MrDots does love DmD more than we can imagine. Just think about how much he made us love our "D".