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You need to keep it for local SEO. Although Google has decided this is a separate product now, its role will certainly change in the future. They have already made changes to the Google Plus app

1. If the listing has good customer reviews, I would not delete it.

2. There are brand pages aside from local pages.

   It really depends on how this was set up. Brand page or local?

You should be able to transition it.

See this article as a reference.

http://localu.org/blog/google-now-allows-brand-pages-become-local-pages/

I see because of the reciprocal nature....

I've searched the forum on this and online and can't seem to find a definitive answer.

Some e-commerce sites that are http use a 302 redirect to the https login while other sites use a 301 redirect. I know 302 is generally not recommended but in this case it may make sense.

Can anyone advise on the correct practice?

Breadcrumbs have been debated quite a bit in the past. Some claim that the last part of the breadcrumb trail should be non-active to inform users they have reached the end. In other words, Do not link the current page to itself.

On the other hand, that portion of the breadcrumb would won't be displayed in the SERPS and if it was may lead to a higher CTR.

Foe example: www.website.com/fans/panasonic-modelnumber

panasonic-modelnumber would not be active as part of the breadcrumb.

What is your take?

You need to keep it for local SEO. Although Google has decided this is a separate product now, its role will certainly change in the future. They have already made changes to the Google Plus app

1. If the listing has good customer reviews, I would not delete it.

2. There are brand pages aside from local pages.

   It really depends on how this was set up. Brand page or local?

You should be able to transition it.

See this article as a reference.

http://localu.org/blog/google-now-allows-brand-pages-become-local-pages/