i dont get it why the original developers are still not working to make this thing even more big....i know the lightening network is in progress though...
First of all, the original "Satoshi" seems to be missing for years.
Second, the Bitcoin development team is working on improving it, but "to make BTC better for mass adoption" is quite vague term and everybody understands whatever he wants from it.
The developers can improve the software, but they will not do (much) advertising, and "mass adoption" is tied to politics (regulation, banks' policies), news (good or bad) and probably price too.
All of us should contribute a little here and there by telling people the benefits of Bitcoin and maybe the steps for easier use.