I seriously doubt there will be a Chapter 3. The corruption meter was a good metric to use when DMD was on Patreon. I believe the studio is now leaving its options open as to how all the levels of corruption (18 flower petals) will be reached.
Sex acts are no longer on a slow-burn pattern. Some side characters' scenes seem to have been left out, thus trimming the total DMD updates. So, unless these omissions are somehow replaced by alternative additions, the original plan (while on Patreon) of 3 Chapters of ~40 updates is off.
There is also patron/donor fatigue to consider. Oc, it is completely up to those payers to decide! I just hope DMD can eventually make a somewhat graceful exit when the end comes.
I think that it will ultimately come to $$.
During Patreon days, DMD was golden goose with lots of $20 pledges (me being one of them for a period of time 'til I got the feeling that Mr Dots started milking a game).
Since game has been on 3 months update cycle, it appears that progress is faster than in chapter 1.
If I am not mistaken, "legal" way to download a game is either to be his patron on Patreon or "buy me coffe" on DMD site.
I usually donate $5 since I feel that it is reasonable price per update (instead supporting couple developers at high level, like I did before, I spread my pledges at $5 - $10 level).
If there is sufficient number of those donations, Mr Dots will be able to hire quality help and game will keep going.
Most of game developers are based outside of US and EU (I know that Mr Dots has some volunteers and help from US)
so Patreon or "Buy me coffee" pledges can be significant source of income, especially if it has been done at such high level like DMD and Melody with qualified team of people behind it.