Hey Nick, as suggested here : Open Staking: Improvement Proposals increasing only the number of slot will but not help entirely. Reason being is that, lots of validator are scripting their way down in the EPOS ranking slot so that if they are below the 0.85 median stake (or 0.7 in the future) so they have free raw-stake (ie bidding 0.5 would always give you 0.85). What it means as well, being in the low range is that they can take more slot and hence just once again discouraging the average validator.
The proposal I made would incentivized the validator to use as less keys as possible. Also it would also help the validator that can’t afford to use multi-key to earn a bit more than if they were to split and be potentially under the last slot.