The wireless landscape is getting tougher, which could pressure Verizon shares, according to MoffettNathanson. The firm slashed its rating on the company to underperform and lowered its price target to $41 from $55. The new target implies downside of more than 9% from where shares closed Wednesday. Part of the reason for the downgrade is how competitor AT & T’s strategy of aggressive promotions has dragged Verizon’s business. “Verizon has…