Fast forward 2015, Google has announced the integration of Blogger directly with Google Domains, allowing Blogger/Blogspot users to purchase a custom domain for their blogs right from Blogger with just a few clicks, thereby making it so easy to connect their blogs to custom domains.
So, if you want to change from .blosgpot to .com, you can grab a custom domain for your blog via Google Domains via the Publishing section of your blog's Settings tab.
According to the source, if you purchase a new domain from Google Domains, it’s also easy to create a new blog for that domain right there.
What's your take on this?
NB: I can help you change to .com here if you can't do it yourself.