Facepalm to OP.
Let's analyze the current top cryptocurrencies after Bitcoin:
1) ETH: Scalability issues greater than those found in Bitcoin. Extremely centralized coin, with no immutability. Effectively a Fed 2.0 coin with the 'too big to fail' DAO situation.
2) Dash: Scalability issues. Fake privacy benefits. Extremely instamined coin; over 20% of existing supply aka a Scamcoin.
3) Monero: Scalability issues greater than those found in Bitcoin. Unprunable; no SPV wallets.
If anything is going to come close to Bitcoin, then it is ETH because the bankers will continue to shill for it because it is effectively centralized.
None of these coins are facing the 'block size debate' because almost nobody is using them for transactions.
Well, ETH and Monero have no block size limit. That doesn't mean they can scale indefinitely - they can't because they are block chain coins. But at least, the limit is just the technological resource usage, and hence, there is no inelastic offer of transaction space. If technology (network, processing, storage) goes up by a factor of 10, then ETH and Monero can handle 10 times more transactions at the same cost. That's about every 5-6 years according to Moore's law. This means that there is no lucrative fee market. Both ETH and Monero have tail emission, meaning that there will not be the battle for fees.
Moreover, ETH as well as Monero have regular hard forks, so they can much easier update to newer technology. For instance, recently, monero switched to ring CT from the former cryptonote tech. That is a more involved and deeper modification than Segwit activation.
Both these coins will face scaling problems, and are not able to allow the earth to buy their morning coffee in the foreseeable future, but at least they will never hit the hard and frozen wall bitcoin set for itself.
DASH is a copy of bitcoin with integrated automatic tumblers. However, DASH being "governed" (and most probably CENTRALLY governed), it can also adapt much easier if something must be changed, like block size. This is even somewhat scary with DASH: in early history, the coin emission has been divided by 4 (there were going to be 84 million coins, and after the 2 million instamine, this has been lowered to 21 million coins, like bitcoin
).
So even though all these coins are block chain based coins that don't scale well, they are in much, much better shape to scale somewhat than bitcoin with its hard wall.