It won't hurt to have 100,000 shiba inu coin in your wallet you know, I'm saying this because I used to have 1,000,000 doge coin in my wallet but got tired of holding it and sold, we both know how much that it today so we can't say if shiba can make its way to where doge coin is right now, it won't hurt to have some in holding
Is Elon musk endorsing Shiba Inu? I don't think so, what happened to the success so far from Shiba Inu is still the same thing you promoting which is fomo (fear of missing out) on Shiba Inu, but playing the Dogecoin card, I don't think Shiba Inu would achieve the Great success Dogecoin had, and infact I don't think Dogecoin would repeat the success, meme coin to me a temporary and I don't see them as surviving for long.
That is totally different direction they have and Doge had might have the chance to survive as it was been in the market for many years, unlike Shiba Inu. It doesn't matter who endorses them but what it matters a lot is the usefulness of the projects and it was to see that they have different purposes for their creation but this dogecoin has been proven already and many Traders are currently using this.
But yes, they are not a good investment especially when we are aiming for the long-term, they are just good at hype.
The fact that they are just good when there is hype, so investing in them for long term will still be unprofitable. Although it won't hurt if you have gained a lot of Shiba Inu in your portfolio, but it will definitely be a huge loss if one day they will end up undervalued or worst no value at all. Maybe hold just a little amount so you won't be depressed seeing their prices depreciating. Shiba Inu was profitable last year, but things will be a lot different this year so just manage the risk.