The low fees (and down the road, a successful Lightning Network) should definitely take some luster away from altcoins that are focused on fast, cheap payments. I expect on-chain fees to rise again, so it's a good idea to consolidate ouputs now while fees are low.
Though the lightning network may drop the fees further, nowadays would be a good opportunity to transfer bitcoin because the fees are lower. Many opt to change to other currency first before transferring paying trading fee but now, they can just directly transfer bitcoin to bitcoin because of the lower fees. Supporters of other coins that always use the fee as a reason to degrade bitcoin just can't use that reason anymore nowadays and this would be good for bitcoin community.
Price of bitcoin I think is also one of the reason why the fee is low and network is not that congested because bitcoin is still recovering and now back below $10k so there isn't that much motivation and hype to make others buy it again creating a network congestion. I believe segwit has been one of the reason as well for this low fee.