That is a very difficult question to ask for big businesses who normally have complex customized programs that allows them to function as a business. But the economic conditions have been forcing a lot of thought into the technology, considering both the advantages and disadvantages of the many successful open source projects that have already been out on the market. To ask that question would result in varying answers depending on who you ask, for large companies that use large programs and technology would not be so keen on adopting such a public technology. This does not however mean that they are not considering them for even some of the staunchest developers of closed systems have been trying out some of these technologies on a limited basis, proving the benefits, which is mainly cost are enticing enough for them to take notice.
IBM has long been in the forefront of the IT industry and they themselves, who are responsible for some of the most complex closed-programs used by many of the biggest multi-national businesses are considering the benefits of cheaper technology that is open source. Many other open source projects sponsored and designed in part by major IT technology players such as Sun Microsystems with BlowFish are revolutionizing the way we develop and use applications that will be opening up to these newer and of course cheaper programs in the future. Call it necessity or simple evolution, cost still determines the feasibility of any system, theoretical or not.