2 Spinoff ideas
We know that the spinoff idea "Female protagonist that wants to meet the Father of her kids" was already proven 2 times (with the 2014 pilot with Greta Gerwig,and with the Hulu series with Hilary Duff). So i think that,if Disney wants to give another life to the HIMYM franchise,there could be 2 godd spinoff ideas,and both are titled "How I Met Your Mother" anyway. Thats why:
1st idea of a "How I Met Your Mother 2.0": Basically,a new story about a man who wants to find the Mother of his kids. A new Ted,but now really Ted,it would be a totally different characters,with different characteristics and a different group. It can be a man like Barney,or like Marshall,or another kind of man. But basically,a new story about a man that wants to find his soulmate. And this time,if possible,dont kill the Mother at the end!
2nd idea of a "How I Met Your Mother 2.0": A lesbian protagonist. A girl that wants to find her soulmate. And that,in the future,had kids somehow (there can be mystery about how they had kids. Was it the protagonist that gave birth to them? Was it her soulmate? Was it someone else that did if for them?). Of course she will also have her group of friends who will be straight and this will give to the series also heterosexual romantic storylines. So i think this idea would be really original.
Those are two ideas for a new How I Met Your Mother spinoff.