No, the fee should be exponential, to keep people from keeping technology out of the public domain longer than necessary.
For example, maybe the fee is $10000 for the first year. This doesn't come close to recouping the cost of a single enforcement action, but it makes sure that someone has some skin in the game. Then every year the cost gets 10x more expensive. Of course you are free to choose your own base and multiplier.
For someone to keep a patent for 5 years, the total cost would be $10k + $100k + $1M + $10M + $100M = $111110000. Maybe it's worth it for a patent like the light bulb. Probably not worth it for a drinking bird toy. But either way, the value decision is up to the patent holder, and the cost of the patent incentivizes rapid monetization rather than squatting.
For example, maybe the fee is $10000 for the first year. This doesn't come close to recouping the cost of a single enforcement action, but it makes sure that someone has some skin in the game. Then every year the cost gets 10x more expensive. Of course you are free to choose your own base and multiplier.
For someone to keep a patent for 5 years, the total cost would be $10k + $100k + $1M + $10M + $100M = $111110000. Maybe it's worth it for a patent like the light bulb. Probably not worth it for a drinking bird toy. But either way, the value decision is up to the patent holder, and the cost of the patent incentivizes rapid monetization rather than squatting.