Then how will miners be incentivized to secure the network? Let’s not forget that most if not all miners conduct mining operations simply because they can earn a living off it.
Yeah, that's probably the strongest argument against OP's idea. But let's say he wasn't talking about bitcoin, but some new altcoin. If fees were frozen for a year, and assuming this was a coin with a large transaction volume there would have to be a
lot of coins in existence, since all those fees would be locked up for what amounts to a very long period of time (unless the standard fee was very low). That was my first thought, but I might be modeling it wrong in my head.
In any case, what OP suggested would never be implemented for bitcoin, because nobody would go for it. I'm also pretty sure the idea has been thought of before and that there's a reason why altcoins haven't adopted a system like that.
Miners will not keep on making this much money in the long run anyway. Let's remember that it will go down more and more with each halving, next halving it will be even less, and the halving after that will be quarter of this, it just keeps going down more and more and that is why we can't always consider miners when we are making discussions like this because they won't be around forever. However even assuming that, we are talking about fees and we are not talking about the rewards.
So, assuming that fee's do come back, even in that case the bitcoins that are mined would still be going to miners, the miners would lose money because they would not be gaining those fees anymore but they would still be making an income from the rewards they mine.