I will not be using BE to mine litecoin as that is currently not possible.
Currently = not ever.
I'm not going to attempt to predict what can and cannot happen in the future in regards to bitcoin tech development. From what I understand, it would be a lengthy, expensive and difficult process to optimize ASIC memory for scrypt algorithms but it's not impossible.
Regardless of what will be developed for Litecoin-specific purposes, a Block Erupter (blade or USB) will *never* be able to mine Litecoins.
LOL
http://www.coindesk.com/asic-miners-litecoin-soon/