The problem that needs to be solved is the low power consumption of the mining machine, low investment, low threshold, and the construction of the mine pool.
Only after the low threshold will investors be willing to run miners for a long time to protect IFC network security
The Antminer L3+ has 504M power and 800W power consumption. If we can obtain a miner with a power consumption of less than 100W, I believe there will be many investors willing to run for a long time.
There are probably older devices that have a lower hash rate and power consumption. For example, a Gridseed blade (2014ish?) has a hash rate of about 5MH/s and a modest power consumption of about 70W. That's an example only, because even a diverse collection of 100 people mining @5MH/s each could be 51% attacked by a single L3+.
I think there needs to be more incentive to mine (such as rewards) rather than just "I want my funds to stay valuable"... otherwise you'll end up in a situation where miners will gradually drop off as they conclude that they're providing little benefit, and everyone else will look after things. You cannot rely solely on altruism to secure a network.