Here's the thing about helpful people melting away. It's their job to melt away so the bereaved can move back ahead with their lives.
I have sometimes needed people to be there for me, and enough folks showed up that I got pulled through.
I have also known people who needed someone and sometimes I've been that person. With the exception of immediate family, the ones I've helped and the ones who've helped me have never been the same people. The universe evens things out for us.
Some people get huge inheritances, others nothing. Some have masses of close relatives living nearby, others are estranged from their families. Some accumulate friends like flies to honey, others can't seem to figure out how to maintain a single friendship. Some are unlucky in employment, others have long-term jobs that fulfill them.
In life, nobody gets it all and virtually nobody gets completely shut out.
When acquaintances make offers to help during a time of difficulty or bereavement, they're nearly always sincere about lending a short-term hand. But they're not offering long-term support. More like if you ask, "Gee if you could bring me something to eat on Thursday that would be great - I can't seem to get it together with food right now." They'll be there on Thursday with a meal. Not every Thursday, mind you, but yes on that one Thursday.
If I'd asked my younger neighbors to go grocery shopping for me in late March, they would have done so joyfully and willingly. However, If I gave them a list every week over the past 4 months, they'd be making excuses and avoiding avoid me like the plague.