From an outside view in :-

Most of the older coins cannot scale to allow the level's of transactions that ETN will need to support in the coming years.  However, the upcoming changes, and specifically the blocksize increase,  are going to greatly help in the short/medium term. 

Take a look at the following link as this explains the different 2nd layer solutions and covers the blocksize increase :-

https://blockgeeks.com/guides/blockchain-scalability/

The interesting point is that as you increase the block size you will not know the true results until it is implemented.  Sure in theory it will increase the speed but can the network/nodes/etc cope with the additional processing power/data.  There are so many variables involved and then you have idiots who will just attack a coin for fun or their own gain.

The good news is that ETN has the option to increase the blocksize and the capability to make changes.  The better news is that this will be first of many block size increases/tweaks as the coin grows over the next year.