There are alternatives developed some years ago. Barriers that comply with quality standardas as ISO. I can't tell about the cost, I guess they are more expensive than doing nothing.
It all comes down to electoral reasons. Ten people claiming for barrier replacement doesn't make much sound. One hundred people make more sound, but the expenditure of the replacement is not worth the votes. As soon as politicians realize the the biker community is united and that they can use public funds to get some votes for them, the barriers will be replaced.
Politicians are very sensitive in Spain about public will. According to many surveys, the change of government in Spain is a matter of 1.5 million people. That is, as in many countries, Spain is bipartidist. Most of the people will vote to his favourite party regardless of who the candidate or the program is. 1.5 million people is not faithfull to any party and will change the vote regarding of the situation of the moment, the candidate or the program.
The most important thing, even if we can't get the politicians to act this time, is that we are getting a lot of media attention, and car drivers start to realize that even when there are madheads out there that crash and burn, motorcyclist are the victims in the accidents, and that nobody deserve to die because of oil or sand on the road, or simply because you take the curve at a wrong speed. It is a very high price for such a mistake.
I personally can't blame politicians this time. Barriers were designed and installed when the number of bikes on the road was small and the bikes were not that powerful. The power and number of bikes was on the rise every year, and the fact that the barriers were proving lethal was difficult to see. I can't blame politicians to think twice before taking decisions that affect public funds. They always try to satisfy the most people.
I guess we should start a campaign over here in the line "You meet the nicest people on a bike"....