WU is advertised everywhere while bitcoin is advertised almost nowhere. I think you're right in that sense.
But once we raise the awareness of BTC then I'm sure people will start adopting it more. Then we'll see WU die.
It won't be that easy. WU has plenty of licenses in each country they operate in to be somewhat of a lone runner when it comes to their type of doing business. You can't permanently make WU vanish, and there is really no need for that. Bitcoin can function perfectly fine alongside WU. Not sure why people want Bitcoin to replace fiat, PayPal, WU, banks, etc. Bitcoin is here and it's working, so use it!!
Yeah people will use with they comfortable are, bitcoin transactions fees is low where as WU has huge fees, once people will get aware about bitcoin, they will surely switch from WU to bitcoin.