Some industries are still in shock as to which way to go even when some of them are accepting BTC already. Take for instance the Webhosting business which some of them are accepting BTC, the majority I believe had not been doing so. What is worse in thier business is that IPFS (peer-to-peer storage system) is sort of a threat.
Some businesses also think they are already late in adopting because the bull run may be over at any moment.
This might be a general perception among investors but I don't think it could be a reason for business not to accept BTC payments. I think a lot of companies are still debating on which way to go, as is the case with the company I work for that accepts BTC payments only as a trial but has not officially launched full-fledged BTC payment system yet.
The main reason is their managers are not yet sure about accepting BTC, let alone integrate it into their business. I am actually the assistant for the CEO and I think the decision to allow BTC payments is based on the expectation of better future revenues for a business after they will start using BTC for payments.
Most of the executives are said to be interested in Bitcoins and are willing to accept them because of that. I personally think a lot of things should be made to work first before they will be used for purposes they were intended for. For example, in the business to business sector (B2B), it would be ideal if a business could use a medium to transfer money worldwide instantly without going through a long payment chain like the usual fiat system. Without being able to make any such system exist for a long time, a lot of businesses won't have an incentive to adopt BTC.
I think the major problem for the industries, and even the economy, is lack of rapid technology adoption.