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I own a small ecommerce site and I've seen where one of my (much) larger competitors have purchased other sites and went the domain-redirect route. According to Open Site Explorer it is helping their SEO a bit. One question I would have is how many of these visitors from the blog are turning into purchasers on your friend's site? If a lot of them are coming and buying products, and you do the domain redirect, then you could potentially lose a lot of sales. You could make up for the lost sales by increasing your rankings for other keywords, but how much of a boost would you need to make up for the lost sales from the blog? When you are weighing your decision, consider the conversion rate from the blog vs. the conversion rate from search engines. Another consideration to make is if both sites rank on page 1 for a lot of keywords, and you cannibalize the blog, then you are down to a single placement on the SERP.

Hey again NickEubanks, 1. checking up on my stats again for my site. its age is 59 days old and has not been registered before. 2. crawl stats are high of 137, average of 61, low of 10. That includes every data point since it is so young(less than 90 days old). 3. seomoz campaign says that I have 78 pages crawled though i dont think all of them should get indexed as pages seemed to get indexed within minutes usually. 59 are indexed. 57 were indexed today and I wrote a post as well as made a new navigation page to keep organized and then it went to 59 within minutes. I don't think tag pages with a single post get indexed or something since some tags do seem to get indexed and also have multiple posts. 4. total links: 1628 from 538 domains. Domain homepage PA of 40 with a DA of 33. Dmozrank 5.3. my page for the keyword i plan to rank first for is PA 38, 67 links from 14 domains. The site ranking in first position is much younger (2 year old site) than the other 6 beating me as I am in position 8. these 6 have 5 with between 60 to 80 DA and one of the worse ranking site on the serps with a DA 46 though it was beating a DA 62. Each also ranges from have very little to quite a lot of links. first i'll share the first position stats as it is related to your main focus. PA 14 DA74, 71 links from 4 domains. all the other 6 are over 10 years old. after my site is a 6 year old site which i am now beating. hope you enjoy this juicy info. so in about 2 months i got to DA33 to answer your original question. This has been fun.

As I feared - there is no straightforward way to predict how fast a website could hypothetically grow their DA, but solid answer. Thanks Ryan.