I don't know how anyone else thinks about this but I don't want her to become the new Heidi Klum. Especially not if she's got so many other options.
What are the other options and why are they more desirable to becoming the next Heidi Klum? Being a model is an amazing profession, especially if you are a in your late teens / early twenties, but a model, particularly a high-fashion model, is a glorified hand-maiden, she basically services the needs of the designers, editors and photographers, as opposed to steering her own ship. If you're at the juncture in your life and career that Miranda is: married with a baby on the way, why would you want the grind that it takes to become a top editorial and runway model when you can be an entrepreneur, author and advocate for causes that you believe in? What more is there for her to achieve in modeling: she has gotten a Victoria's Secret Angel contract; she has been on the cover of Vogue Italia, the September issue at that; she has walked for Prada and been in a Prada campaign? Not to sound morbid, but if she died tomorrow or if she died eighty years from now, the modeling portion of her obituary would not be substantially different.
PS1:
When I started composing this post I was going to state that the one of the things that she has not achieved in modeling is being on the cover of Vogue in her home country, but then I scrolled down.
PS2:
I am not saying that Miranda should quit modeling at all, but at this stage it is more about being a brand, and walking fifty shows a season and being in a Vogue editorial every month is not going to increase her brand any more than covering best selling issues of magazines, being the face of successful campaigns, being someone that the public has a positive impression of, being Mrs. Orlando Bloom and having her picture taken holding a puppy, so Miranda should just do her thing whichever way she sees fit.