If you use OMNY there is a max you can be charged per week. Essentially all rides are free after your 12th ride per 7 day period. Since the cost of a ride on busses or subway is $2.90 that works out to a max of ~$35 per week for unlimited rides all over the city via train or bus.
I don't live in NYC anymore, but when I did I could never imagine owning a car given the financial burden not being justifiable, but obviously those that do have one are likely in a much higher tax bracket than I am, or are going there for business purposes.
Taking NJT one way is $6.75 for me. I also need to take a subway into the office (@$2.75/ride) to make it in on time so $19/day. One could buy a monthly pass at $184/mo or move to somewhere with PATH but for most people dropping $184/month is a lot of money for train tickets and most people who live in NJ need a car for life in NJ.
I don't think this is a good state of things. It would be great if we had plans to expand PATH or increase service times of NJT or build more housing next to NJT/PATH that normal people could afford but all of these seem very unlikely.
As someone who lives in NJ, I'd very much like to see this change. There's a ton of things within easy biking distance of my house, but no safe way to get there. Some decent bike infrastructure would go a long way.
I do still think that for most others near public transit it would still net less costly to use that than to drive given cost of parking and gas on top of these new fees.
Monthly garage parking in midtown is like $800/month.
However, this $15 charge is a floor. If you commute into the city by car, you're paying for parking and gas (if driving ICE) as well.