What is the likelihood of a company losing potential customers by not having active social media sites?
If they weren't meant to be your customer, it probably won't matter. If you have active social sites it's a good opportunity to bring in new customers. Some customers may do research and feel that you aren't doing a good job in social, especially if you are going after a young or hip demographic. That may cause you to lose them as a customer.
My question is how could Starbucks reach out to people who aren't social media users (mostly elderly people)? How could they communicate and deliver the image they want to be known as?
You can't get someone on social media if they aren't on social media. Luckily may older adults are on Facebook and with targeted posts you can show older adults many things about Starbucks. Remember sometimes seeing a social post is like seeing a commercial. You don't remember it, but it makes you choose the brand next time you see it.
My question is can it be possible to have too many social media accounts for your business?
Of course. You need to decide how many you can manage, and what is appropriate for your company. Sometimes I like to register all the accounts just to have them, even if I don't use them all.
Do you think that having a webpage that is more compact and less clicks is more or less benificial than having a page like Apple's where there are many clicks, links, and routes to get to different infomation, pictures, etc. about a product?
Well Apple has many things to show and sell. Though there are many clicks, it's easy to find what you're looking for. But yes, of course less is more sometimes.
What kind of resources are involved with a social media team responsible for running 10+ social media accounts?
A lot. You can use a management tool and some enterprise management tools allow for permissions and many layers of management and publishing. I suggest you look into it.
How does a brand decide when and how often to post on each platform without bombarding the consumer with posts about that brand?
You need to have a schedule of posts based on the social platform and your goals. It's good to figure this out in advance and stick to it. Be aware not to bomard your audience. Some social platforms you can post more often than others for sure. Twitter for example.