To reach the unreachable

The effect of online marketing in uplifting a business cannot be neglected; still there is always an audience that is not available on Facebook or Twitter. For the need to approach that percent of audience, offline marketing seems to be still effective and lively. Television, bill boards, brouchers, transit advertising, are thought to be out dated but the impact they create for the advertisers to reach the whole population is still successful. Do not you agree?

Kind of a low effort post.

But yes offline marketing works better for some demographics. Most notably baby boomers and affluent individuals.

Direct mail, sales letters, and posters/billboards still have their place but must be aware of new methods of advertising if they want to be successful. People get bombarded constantly by ads in this age. So if you can't find a way to get attention you might as well light that money on fire.

Most people would ignore the ads. I cannot remember the last time I saw a billboard and went,"Damn that's some crazy shoes xyz is advertising. Let me go buy them asap." It's more likely I see a trailer or review on YouTube before buying it.

Are we talking about a neighborhood restaurant then yes, some flyers in the mailbox might be good, if not then I strongly disagree with you.
Why?
Well first of all offline marketing costs more money compared to online.
Problem 1. putting up an ad offline, it's very local...
Lets say you put up a billboard somewhere "Buy my shit" or something. How many people is in that area, whats the reach? 100 people, 1000 people?
If you are on facebook the maximum possible reach is around 1/7 of earth's population.
Do you need to reach that 3'rd world audience? Do you sell adult diapers?

With twitter and facebook you can reach so many more compared to walking around town putting flyers in mailboxes.
In one hour i can get to 100-200 people offline with that method and they will probably just put the paper it in the trash as soon as they see it.
See every twitter account as a a mailbox, as soon as they follow your account you can promote your stuff reaching 1000's of people in just 10 sec, and how much did that tweet cost you?

I believe it could be useful but also very specific and higher cost compared to online tools.
Sorry if does not add much

If you dig a bit deeper into your research, you will find that the most effective form of advertising (both online and offline) for most types of businesses is an offline method. And its the cheapest for the business owner.