These are real risks to these companies.
Your in-house teams can build replacements, it's just a matter of headcount. With Claude, you can build it and staff it and have time left over. Then your investment pays dividends instead of being a subscription straight jacket you have to keep renting.
I think there's an even faster middle ground: open source AI-assisted replacements for SaaS are probably coming. Some of these companies might offer managed versions, which will speed up adoption.
Lets take Figma as an example, Imagine you have 1000 employees, 300 of them need Figma, so you are paying 120k per year in Figma licenses. You can afford 1 employee working on your own internal Figma. you are paying the same but getting 100x worst experience, unless your 1 employee with CC can somehow find and copy important parts of Figma on his own, deploy and keep it running through the year without issues, which sounds ludicrous.
If you have less than 1000 employees it wouldnt even make sense to have 1 employee doing Figma
If you need rich outputs, there are tools for that now too.
Let me put it another way - would you want to be Adobe or Figma right now?
And applied to the original point, would you feel comfortable being a SaaS company right now?
So you end up spending the money elsewhere? with exploratory design you can easily spend 10k a month on these models as a company of 1000, thus completely losing any monetary savings. Anyway you look at it, Saas worked because costs were spread out and low enough to not optimize it too much.