Not exactly, first off all, their slogan "Gotta catch 'em all" was abandoned a LONG time ago.
(Well not really, I believe they still use it in Pokemon Chronicles, but thats a different story)
Also, catching every Pokemon to received the National Dex would be too hard for some people, due to some reasons
- Trade for Dialga/Palkia
- Trade for other starters
- Trade for version exclusives
- Manaphy
Hell no, receiving the Nation Dex isn't supposed to be hard, in fact, in all the games that featured a Nation Dex, it is quite easy to get, you're kinda saying it's supposed to be a big challenge.