Adobe Flash has had security issues over the past few years, and web browser vendors are now disabling flash by default, planning to end support entirely within the next few years.
Do you currently have a Flash intro or splash page on your website? What happens when customers who have flash disabled in their browser visit your site? They may see something like this screenshot.
Visitors to your website make a decision whether to stay or move on within 3 seconds of clicking the link to your website. If you use an introductory Flash video between your visitors and your content, and they have Flash disabled in their browser, odds are that they will just move on to the next site in their search results.
It would be wise to take steps now to redesign your website without using Flash.